Dye and process for preparing the same.



considerably below, the red dye is formed.

Uniiit srn'frns PATENT OFFICE.

BERTEAND S. SUI/EMERS, 03? PORT HURON, MICHIGAN.

DYE AND PROCESS FOR PREPARING THE SAME.

Specification of Letters Patent. Application filed June :29, 1909 Serial No. 505,083.

No Drawing.

To all whom it may concern:

Be it known that l, Bnn'rmxn S. Sun- MERS, a. citizen of the United States, rcsi ling at Port Huron, in the county of St. Clair and State of Michigan, have invented a certain new and useful Dye and a ,lrocess for Preparing the Some, of which the following is a specification.

My invention relates to the prrnhicliu-n of a new and useful dye and the process of preparing the some, such dye being so called sulfur red dye stull'. i

I have discovered that certain yellow and orange dye stutls, when treated with sodium sullid, preferably in an alkaline hath, are changed to red dye stulis, known as sullur dyes, and act in the some manner as such dyes. For instance, such dyes as direct yet; low T and chloranl'in orange Tltlt act in this way. However, in practising my in vention I prefer to use a yellow dye stult', known as eurcumin S, this dye heing a sodium saltof the si'i-cnllcd aZoxy-stiihene-di-- sultonic acid, having the formula N cucam o N outrun, I Sfntw'a and being obtained by heating p-nitrotoluene-sulfonic acid with concentrated aqueous caustic soda. When this dye which is extremely active chemically is heated with sodium sulfid, preferably in aqueous solution, at a temperature of l)0illI1f ,U10\"n Such red dye can he im'med, however, in accordance with the process of my im'enii'oi'z either by fusing the initial yellow dye with sodium sulfid, or by hosting; an. :nuieous sohit-ion of the initial dye with sodium sulfid. The chemical reaction which takes place transforms the initial yellow dye to 1. per manent and fast red dye of the sulfur class, differing entirely from the initial dye used in its production and belonging to a rlitt'erent class. The resultant dye appears in the form of a red p size, or, when thoroughly Patented Feb. 18, 1913.

dry, in the form of a red powder. The red powder or paste thus formed is easily solu-. 50 lilo in water and niuy he dissolved in hot water and added in the usual manner to the hath in which goods to he dyed are trcalii,

I have found that this effect is considc-ritljily enhanced by the presence of from 3 to 5% di-chromate of potash (calculated-on the weight of the material to he dyed), which may he added to the dye, or added to the dye bath, as is the usual custom with ussistants. -While by this addition, some chromic hydroxid is precipitated, no dcletel-ions effect is experienced by its presence in the bath.'

Iln practising my invention, I take 5 to 10% (calculated on the weight'of the goods to he dyed) of the yellow or orange dye stulf, above mentioned. and ,add to the same from 3 to 5% caustic soda, and from 5 to 10% sodium snll'id. The dye is dissolved in hot wat r in the usual way, and added to the bath It will he seen from this that the yellow or orange dye can he treated exactly as if it were a red sulfur dye in the beginning, that is, the change being clt'ectcd in the process of dissolving the dye. In this latter case the red dye is obtained in a solution which may he added directly to' the bath. While, therefore, the dye may he reduced from said solution to the form of.

ared paste, as hereinhefore stated, it will he understood that the dye of my invention 1 is present in the solution itself bcforcbeing so reduced. 4

I claim:

1. The process of making a dye stuff which consists in heating a sodium salt of amxyslilbenedi-sulfonic acid with sodium sullid.

2. The process of making a dye stuff which consists in causing the yellow dye 90.

stutt known as curcumin S to chemically combine with sodium sulfid.

BERTRAND S. SUMMERS. \V i tncsscs G120. T, Corrnnnonu, H.\nmn'r Tl Smmmns. 

